reach for the sky
reach for the sky {v. phr.}, {slang}
1. To put your hands high above your head or be shot. — Usually used as a command.
A holdup man walked into a gas station last night and told the attendant "Reach for the sky!"
Syn.: HANDS UP.
2. To set one's aims high.
"Why medical technician?" asked her father. "Reach for the sky! Become a physician!"
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Source: A Dictionary of American Idioms